OFFSET
0,3
REFERENCES
Jonathan L. Gross and Thomas W. Tucker, Enumerating graph embeddings and partial-duals by genus and Euler genus, ECA 1:1 (2021) Article S2S1. See Table 1. (Beware errors!)
J. L. Gross and J. Yellen, eds., Handbook of Graph Theory, CRC Press, 2004; p. 649.
FORMULA
Reference gives a recurrence.
EXAMPLE
Triangle begins:
1
1
4 2
40 80
672 3360 1008
16128 161280 185472
CROSSREFS
KEYWORD
nonn,tabf,more
AUTHOR
N. J. A. Sloane, Nov 19 2006
STATUS
approved